[PATCH] D80476: [DebugInfo/llvm-objdump] - Print "ZERO terminator" for terminator entries when dumping .eh_frame.

[George Rimar via Phabricator via llvm-commits]

This revision was automatically updated to reflect the committed changes.
Closed by commit rG2e365ca2f7ce: [DebugInfo/llvm-objdump] - Print "ZERO terminator" for terminator entries when… (authored by grimar).
Herald added a subscriber: jrtc27.

Changed prior to commit:
  https://reviews.llvm.org/D80476?vs=265869&id=266149#toc

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D80476/new/

https://reviews.llvm.org/D80476

Files:
  llvm/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
  llvm/test/tools/llvm-objdump/eh_frame-mipsel.test
  llvm/test/tools/llvm-objdump/eh_frame_zero_cie.test


Index: llvm/test/tools/llvm-objdump/eh_frame_zero_cie.test
===================================================================
--- llvm/test/tools/llvm-objdump/eh_frame_zero_cie.test
+++ llvm/test/tools/llvm-objdump/eh_frame_zero_cie.test
@@ -1,11 +1,6 @@
 # RUN: llvm-objdump --dwarf=frames %p/Inputs/eh_frame_zero_cie.o 2>/dev/null | FileCheck %s
 
-# CHECK: .eh_frame contents:
-
-## FIXME: GNU objdump prints "00000000 ZERO terminator" instead.
-# CHECK: 00000000 00000000 00000000 CIE
-# CHECK:   Version:               0
-# CHECK:   Augmentation:          ""
-# CHECK:   Code alignment factor: 0
-# CHECK:   Data alignment factor: 0
-# CHECK:   Return address column: 0
+# CHECK:       .eh_frame contents:
+# CHECK-EMPTY:
+# CHECK-NEXT:  00000000 ZERO terminator
+# CHECK-NOT:   {{.}}
Index: llvm/test/tools/llvm-objdump/eh_frame-mipsel.test
===================================================================
--- llvm/test/tools/llvm-objdump/eh_frame-mipsel.test
+++ llvm/test/tools/llvm-objdump/eh_frame-mipsel.test
@@ -1,28 +1,25 @@
 # RUN: llvm-objdump --dwarf=frames %p/Inputs/eh_frame.elf-mipsel | FileCheck %s
 
-# CHECK: .eh_frame contents:
-
-# CHECK: 00000000 00000018 00000000 CIE
-# CHECK:   Version:               1
-# CHECK:   Augmentation:          "zPLR"
-# CHECK:   Code alignment factor: 1
-# CHECK:   Data alignment factor: -4
-# CHECK:   Return address column: 31
-# CHECK:   Augmentation data:     80 90 0B 41 00 00 0B
-
-# CHECK:   DW_CFA_def_cfa: reg29 +0
-
-# CHECK: 0000001c 00000018 00000020 FDE cie=00000000 pc=00400890...004008dc
-# CHECK:   DW_CFA_advance_loc: 4
-# CHECK:   DW_CFA_def_cfa_offset: +24
-# CHECK:   DW_CFA_advance_loc: 4
-# CHECK:   DW_CFA_offset: reg31 -4
-# CHECK:   DW_CFA_nop:
-
-## FIXME: GNU objdump prints "00000038 ZERO terminator" instead.
-# CHECK: 00000038 00000000 00000000 CIE
-# CHECK:   Version:               0
-# CHECK:   Augmentation:          ""
-# CHECK:   Code alignment factor: 0
-# CHECK:   Data alignment factor: 0
-# CHECK:   Return address column: 0
+# CHECK:       .eh_frame contents:
+# CHECK-EMPTY:
+# CHECK-NEXT:  00000000 00000018 00000000 CIE
+# CHECK-NEXT:    Version:               1
+# CHECK-NEXT:    Augmentation:          "zPLR"
+# CHECK-NEXT:    Code alignment factor: 1
+# CHECK-NEXT:    Data alignment factor: -4
+# CHECK-NEXT:    Return address column: 31
+# CHECK-NEXT:    Personality Address: 0000000000410b90
+# CHECK-NEXT:    Augmentation data:     80 90 0B 41 00 00 0B
+# CHECK-EMPTY:
+# CHECK-NEXT:  DW_CFA_def_cfa: reg29 +0
+# CHECK-EMPTY:
+# CHECK-NEXT:  0000001c 00000018 00000020 FDE cie=00000000 pc=00400890...004008dc
+# CHECK-NEXT:    LSDA Address: 0000000000400a90
+# CHECK-NEXT:    DW_CFA_advance_loc: 4
+# CHECK-NEXT:    DW_CFA_def_cfa_offset: +24
+# CHECK-NEXT:    DW_CFA_advance_loc: 4
+# CHECK-NEXT:    DW_CFA_offset: reg31 -4
+# CHECK-NEXT:    DW_CFA_nop:
+# CHECK-EMPTY:
+# CHECK-NEXT:  00000038 ZERO terminator
+# CHECK-NOT: {{.}}
Index: llvm/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
===================================================================
--- llvm/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
+++ llvm/lib/DebugInfo/DWARF/DWARFDebugFrame.cpp
@@ -304,6 +304,12 @@
 }
 
 void CIE::dump(raw_ostream &OS, const MCRegisterInfo *MRI, bool IsEH) const {
+  // A CIE with a zero length is a terminator entry in the .eh_frame sextion.
+  if (IsEH && Length == 0) {
+    OS << format("%08" PRIx64, Offset) << " ZERO terminator\n";
+    return;
+  }
+
   OS << format("%08" PRIx64, Offset)
      << format(" %0*" PRIx64, IsDWARF64 ? 16 : 8, Length)
      << format(" %0*" PRIx64, IsDWARF64 && !IsEH ? 16 : 8,


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